RU2525386C2 - Thermal gas chemical composition and its application for well bottom and remote zones of productive stratum - Google Patents

Abstract

FIELD: oil-and-gas industry.

SUBSTANCE: proposed composition is produced by sequential injection of combustible oxidative composition of COC and reaction initiator. Binary stable COC comprises the following components ion wt %: ammonium nitrate - 15-50, sodium nitrite - 15-40, stabiliser - 0-2, emulsifier - 0.1-2, oil - 10-25, water making the rest. Reaction initiator for binary COC represents a 15-37% solution on inorganic acid. Reaction initiator for binary COC comprises the following elements in wt %: ammonium nitrite - 15-50, sodium nitrite - 15-40, stabiliser - 0-2, thickener - 0.1-0.5, water making the rest. Reaction initiator for BSV represents a 15-100% solution or emulsion of organic acid in hydrocarbon medium. Proposed method comprises injection of COC, injection of buffer fluid, injection of reaction initiator corresponding to injected COC and injection of squeezing fluid.

EFFECT: higher efficiency and safety.

4 cl, 2 tbl, 2 ex, 2 dwg

Description

The invention relates to the oil and gas industry, in particular to compositions and methods for thermogasochemical treatment of the bottomhole and remote zones of carbonate and terrigenous reservoirs of wells.

The invention can be used in conditions of normal and low reservoir pressures to increase the permeability of the bottom-hole zone of the reservoir and increase the productivity of the well in the production of oil, gas and gas condensate. First of all, the invention is aimed at expanding and deepening natural and the formation of newly created artificial cracks, with the subsequent exposure to a stable thermogasochemical binary composition (BSS) and a viscous binary composition (BSV) on the reservoir.

A known method of thermogasochemical impact on the bottomhole formation zone (TGHV), in which under the pressure of the gases generated during the combustion of the powder charge at the bottom of the well, the formation ruptures (I.T. Mishchenko. Downhole oil production. "Oil and Gas", Russian State University of Oil and Gas named after IM Gubkin. Moscow 2007. "UDC 622.276.5 p. 258). In this method, a powder charge of limited power is delivered to the bottom of the well by a wireline.

During the combustion of the powder charge, the formation of powder gases occurs, which act on the bottomhole formation zone.

The method of exposure to powder charges has been used in the oil and gas industry for a long time and has not shown high efficiency.

A known method of processing the bottom-hole formation zone using the technology of thermoacid treatment of the bottom-hole formation zone. The basis of the existing technology is the use of thermal energy, which is generated by the interaction of a solution of hydrochloric acid with metallic magnesium (I.T. Mishchenko. Downhole oil production. “Oil and Gas. 2007” UDC 622.276.5 p. 253-256). This reaction proceeds with the release of thermal energy, which heats the acid solution and formation, melts paraffin and tar deposits. The remaining acid solution, after interacting with magnesium, dissolves the rock purified from deposits, increasing the size of the channels and cracks through which the product enters the well. The method is not effective enough due to the insufficient heating temperature of the bottomhole zone necessary to remove deposits. In the process of pumping a 15-18% cold HCl solution through a magnesium layer, the temperature of the bottom-hole zone does not reach the desired temperature necessary to remove paraffin and tar deposits and create favorable conditions for the reaction of hydrochloric acid with the rock.

There is a method of thermochemical treatment of the bottom-hole zone of a formation by pumping into this zone a suspension of granular magnesium and ammonium nitrate in a hydrocarbon-based fluid, followed by pumping a solution of hydrochloric acid into the formation (A.S. 640023, IPC 2 E21B 43/24). In this case, hydrochloric acid, interacting with magnesium, increases the temperature of the acid and initiates the decomposition of ammonium nitrate. The main sources of heat are: the reaction of magnesium with hydrochloric acid, the decomposition of ammonium nitrate and, at the final stage of processing, possible ignition of hydrogen with nitric oxide. The last stage of the method involves the explosion of a mixture of gases, hydrogen and oxygen, which can adversely affect the state of the cement ring and the column itself in the processing interval.

Known methods for thermochemical treatment of the bottom-hole formation zone by injection of combustible-oxidizing compositions (GOS) into this zone, followed by the introduction of combustion initiators: tableted powders of aluminum and chromium oxide (Patent RU 2126084); tablets from a mixture of sodium borohydride and sodium peroxide (Patent RU 2154733), a method for treating the bottom-hole zone of a formation by sequentially injecting a mixture of magnesium and propant with liquids based on carbon or water, GOS and acid composition (Application RU 2009115499).

The main disadvantages of the above methods are:

1. Use in the processing of crystalline substances in the form of a suspension, which significantly limits their penetration into the bottomhole formation zone;

2. The high cost of the starting components;

3. The danger of initiating GOS combustion directly at the wellhead and in the wellbore due to the uneven distribution of crystalline and tableted combustion initiators.

A known method of thermochemical treatment of a formation, including injecting into a zone of a productive formation a thermogas-forming composition (TGS) containing an aqueous solution of ammonium nitrate (ammonium nitrate), ammonium chloride or ammonium hydrogen phosphate, introducing into the zone of the thermogas-forming composition a powder charge - a combustion initiator [Patent RU 2064576] .

The main disadvantages of the method are:

1. Use as an initiator of explosives;

2. The complexity of the method;

3. The impact of high pressures on the wellhead and the cased hole, which can lead to disruption of both the column itself and the annular cement stone, and the equipment lowered into the well.

Known fuel-oxidizing composition (GOS) for thermogas-chemical treatment of wells, in which glycerol is introduced as fuel (Patent RU 2100583).

The main disadvantages of the composition are the low washing ability to remove paraffin-resinous deposits in the rock and the low process safety.

Closest to the proposed invention is a method and composition for the chemical initiation of combustion of an aqueous solution of a fuel-oxidative composition during pressure treatment of a formation [RU 2154733, IPC E21B 43/263], which is adopted as a prototype.

The invention uses the combustion of aqueous solutions of fuel-oxidizing compositions (GOS) used to expose the productive formation to the pressure of gaseous products of combustion to create cracks or fractures in the well. In the method of "chemical initiation of burning an aqueous solution of a fuel-oxidative composition during pressure treatment of a formation", a composition obtained in the form of compressed tablets from a mixture of components of the following composition, wt.%: Sodium borohydride 85-95, sodium peroxide 5-, is used as a combustion initiator-accelerator fifteen. The initiator is used in an amount of 2-5% by weight of an aqueous solution of GOS.

In the prototype, GOS uses aqueous solutions of ammonium nitrate and water-soluble combustible compositions of organic origin.

This method has a number of significant disadvantages. Since the oxidation (combustion) reaction occurs immediately in the production casing at pressures significantly exceeding the strength of the casing and at high temperatures, which leads to disruption of both the casing and annular cement stone and underground equipment lowered into the well. Cracks in the formation, if they form, are small and do not lead to a significant increase in well productivity. When using a combustion initiator in the form of tablets, a special device is required to deliver them to the combustion zone.

The present invention is directed to the creation of new safe thermogasochemical compositions BSS and BSV and a method for their use for processing the bottom-hole and remote zones of the formation, which allows to increase the efficiency of processing with increased process safety. In the proposed method, the combined heat and gas methods of influencing the productive zone of the formation due to the thermobaric reaction between the reactants with the release of a large amount of heat and gaseous products.

A thermogasochemical composition is proposed for treating the bottom-hole and remote zones of the reservoir, obtained by sequential injection of the GOS fuel and reaction composition into the well and the initiator of the reaction, characterized in that they use GOS containing, wt.%:

ammonium nitrate 15-50 sodium nitrite 15-40 stabilizer 0-2 emulsifier 0.1-2 oil 10-25 water rest

and a reaction initiator representing a 15-37% inorganic acid solution

or GOS, containing, wt.%:

ammonium nitrate 15-50 sodium nitrite 15-40 stabilizer 0-2 thickener 0.1-0.5 water rest

and a reaction initiator, which is a 15-100% solution or emulsion of an organic acid in a hydrocarbon medium,

at the same time, a reverse emulsion of an aqueous solution of ammonium nitrate and sodium nitrite in oil with an emulsifier is prepared for the BSS combustible composition and injected into the well with subsequent injection of inorganic acid in a ratio of 1: 1 to 3: 1, and a highly viscous aqueous solution is prepared for the BFS combustible composition ammonium nitrate, sodium nitrite with stabilizer and thickener additives, followed by the introduction of a chemical reaction initiator in the form of a solution of organic acids into the zone of the thermogas-forming composition glevodorodnoy environment.

In the method of processing the bottom-hole and remote zones of the productive formation of production wells, including the injection into the reservoir of GOS containing, wt.%:

ammonium nitrate 15-50 sodium nitrite 15-40 stabilizer 0-2 emulsifier 0.1-2 oil 10-25 water rest

or GOS containing, wt.%:

ammonium nitrate 15-50 sodium nitrite 15-40 stabilizer 0-2 thickener 0.1-0.5 water rest

injection of a buffer liquid into the formation; injection of a reaction initiator into the formation of a 15-37% solution of inorganic acid or a 15-100% solution or emulsion of an organic acid in a hydrocarbon medium corresponding to the injected GOS; injection of a squeezing liquid.

Saturated combined aqueous solutions of ammonium nitrate and sodium nitrite can be used to treat the reservoir zone in the form of inverse hydrocarbon emulsions (composition BSS) or highly viscous (with the addition of guar gum or polyacrylamide composition BSV) aqueous solutions of ammonium nitrate and sodium nitrite.

The inverse hydrocarbon emulsion of inorganic salts injected into the reservoir is initiated (BSS composition) by the injection of an aqueous solution of inorganic acids (including hydrochloric acid), and the high-viscosity aqueous solution of inorganic salts with guar gum (BSV composition) is injected with a solution of organic acids (acetic acid) in hydrocarbon medium.

In addition to the recommended initiation of aqueous solutions of ammonium nitrate and sodium nitrite, it is possible to use the temperature factor, which appears when there is a parocyclic effect on the productive layers of the wells.

The choice of the application of the indicated thermogasochemical compositions BSS and BSV is due to the availability of components and their acceptable cost, ease of preparation and speed of work, low corrosivity to field equipment, a deeper effect on the formation and processing of the bottomhole formation without precipitation, the safety of personnel during preparation and for the protection interests labor and environmental ecology.

For a safe process flow, the temperature-time parameters of the described reaction were determined. The general conclusion from the accumulated data is that at a system temperature above 60 ° C, the gas evolution process proceeds at a rate sufficient for practical purposes. The higher the temperature differs from 60 ° C to the lower side, the lower the reaction rate and the introduction of catalysts in the form of acids is necessary to ensure an acceptable rate of gas evolution.

Based on experimental data, it was found that the gas number for sodium nitrite at a temperature of 80 ° C is 300 ml. The gas number realization coefficient during the interaction of the blowing agent with a pure oxidizing solution will be about 92% at 80 ° C, and only 9.2% at 40 ° C.

The safety of the technology for the preparation of reactive solutions of ammonium nitrate and sodium nitrite, combined into one system, is stabilized by the creation of an alkaline medium at ordinary temperature.

The solution of sodium nitrite and ammonium nitrate stabilized by additives practically does not decompose at a temperature of 20-25 ° C and can be stored for more than a day. Such a solution is sufficiently stable at 50 ° C; heating for 30 minutes leads to slight gas evolution, which does not reduce its performance when adding acid.

The reaction mechanism of the interaction of sodium nitrite with ammonium nitrate in the presence of hydrochloric acid:

Examples of the preparation of thermogasochemical compositions BSS and BSV according to the invention in laboratory conditions.

Example 1

The thermogasochemical composition of BSS is an aqueous solution of ammonium nitrate and sodium nitrite in the form of a reverse, hydrocarbon (oil) emulsion.

The thermogasochemical composition of BSS is prepared on the basis of an aqueous solution of ammonium nitrate and sodium nitrite in oil in the presence of an emulsifier (SEM, PGT-S, DTMT). The procedure for preparing the emulsion was as follows: in a weighed portion of water from 30 to 50 g preheated to 50 ° C, 25 to 40 g of ammonium nitrate and 15 to 30 g of sodium nitrite were successively dissolved with stirring, and a solution was obtained with a density of 1, 13 to 1.39 g / cm ³ . To stabilize it, 2-10 g of soda ash and 0.01-1 g of pyridine were introduced. Next, a mixture of 8 to 30 g of oil and 0.01-1 g of an emulsifier (SEM or PGT-S) was prepared and the binary solution was emulsified in this mixture at room temperature in an apparatus with a stirrer at n = 2400-2500 rpm for 3-4 minutes

The reactivity of the obtained emulsion with the decomposition initiator was evaluated according to the following scheme: about 40 g of the emulsion was poured into a test tube with a diameter of 30 mm and then 10-30% hydrochloric acid solution was added in an amount of 10-20 g. The reaction was visually monitored by gas evolution and temperature change, measured thermocouple immersed in the reaction mass with the conclusion to the PCB. At the same time, a large amount of gases was released and the temperature increased.

The results are recorded in tabular form and in graphical form.

The table shows data on temperature over time and recalculated for the released heat of reaction. The graphs show the increase in temperature over time, the rate of heat release and the released heat of reaction. The results of the study of the thermogasochemical composition of the FSB according to the heat release rate in the adiabatic mode are shown in Table 1 and are shown in graphs 1 and 2.

Table 1. The results of studies of the THC composition of the FSB in adiabatic mode. Time from start of experiment sec hail hail hail mW / g J / g min h: m: s d_time Ta_n Ta_k Tkam dq Q 0.05 12:23:09 0:00:03 3.88 36,270 37,295 23.59 1058,195 4,102 0.12 12:23:13 0:00:07 4.38 37,295 38,320 23.59 937,286 8,203 0.20 12:23:18 0:00:12 4.25 38,320 39,355 23.75 973,807 12,344 0.25 12:23:21 0:00:15 4.25 39,355 40,381 23.81 965,074 16,445 0.32 12:23:25 0:00:19 4.13 40,381 41,396 23.89 984,849 20,508 0.40 12:23:29 0:00:24 3.63 41,396 42,412 23,99 1120,381 24,570 0.45 12:23:32 0:00:27 3.63 42,412 43,418 24.14 1109,914 28,594 0.50 12:23:35 0:00:30 3.25 43,418 44,453 24.28 1273,647 32,734 0.55 12:23:38 0:00:33 3.00 44,453 45,479 24.36 1366,732 36,836 0.60 12:23:42 0:00:36 3.00 45,479 46,514 24.59 1379,748 40,977 0.65 12:23:45 0:00:39 2.75 46,514 47,568 24.73 1534,091 45,195 0.70 12:23:48 0:00:42 2.63 47,568 48,604 24.98 1577,381 49,336 0.73 12:23:50 0:00:44 2.25 48,604 49,609 25.08 1786,606 53,359 0.78 12:23:53 0:00:47 2,38 49,609 50,664 25.29 1776,316 57,578 0.82 12:23:55 0:00:49 2.13 50,664 51,719 25.44 1985,294 61,797 0.88 12:23:59 0:00:53 2.00 52,734 53,770 25.76 2070,313 70,000

0.93 12:24:02 0:00:56 1,63 54,814 55,840 25.96 2522,486 78,281 0.97 12:24:04 0:00:58 1,50 55,840 56,924 26.16 2890,625 82,617 1,03 12:24:08 0:01:02 1.38 60,020 61,104 26.54 3153,409 95,000 1.12 12:24:13 0:01:07 1.13 64,365 65,479 26.98 3958,333 112,383 1.33 12:24:26 0:01:20 1.38 79,268 80,371 28.53 3210,227 171,992 1.45 12:24:33 0:01:27 1.25 85,713 86,777 29.45 3406,250 197,773 1.55 12:24:39 0:01:33 1.88 89,834 90,879 30.32 2229,167 218,438 1,60 12:24:41 0:01:36 1,63 90,879 91,963 30.62 2666,628 222,773 1,67 12:24:45 0:01:40 2.63 92,998 94,043 31.26 1592,262 231.094 1.72 12:24:48 0:01:43 3.00 94,043 95,059 31.78 1354,167 235,156 1.78 12:24:53 0:01:47 4.00 95,059 96,074 32.51 1015,371 239,219 1.85 12:24:57 0:01:51 3.88 96,074 97,109 33.28 1068,273 243,359 1.93 12:25:02 0:01:56 5.00 97,109 98,135 34.27 820,313 247,461 2.08 12:25:11 0:02:05 8.75 98,135 99,141 36.10 459,769 251,484 2.40 12:25:30 0:02:24 19.63 99,141 100,147 40.36 204,964 255,508

Example 2

The thermogasochemical composition of BSV is a highly viscous aqueous solution of ammonium nitrate and sodium nitrite with the addition of guar gum or polyacrylamide.

The preparation of the thermogasochemical composition of BSV is based on ammonium nitrate and sodium nitrite with the addition of guar gum or polyacrylamide.

In a predetermined amount of water, the stabilizer (soda ash) was dissolved and ammonium nitrate and sodium nitrite were added with stirring until a uniform solution was formed. A thickener was added to the resulting saline solution and the solution was stirred at a temperature of 30 ° C until a homogeneous solution was formed.

Thermogasochemical composition BSV contains wt.%:

Ammonium nitrate 15-50 Sodium nitrite 15-40 Stabilizer 0-1.5 Thickener 0.1-0.5 Water rest

A solution of an organic acid in a hydrocarbon medium was used as a decomposition initiator.

When using the initiator of decomposition of a solution of an organic acid in oil, a concentrated or aqueous solution of acetic acid was taken and mixed with oil in predetermined proportions.

The order of the experiment.

An aqueous salt solution was poured into a 100 ml thermos flask with a diameter of 45 mm, a thermometer was installed, and the initiator solution in oil was added (without stirring). The initial temperature was fixed. The degree of the reaction was determined by the intensity of gas evolution and temperature change over time. The experimental results are shown in table 2.

Table 2. The results of studies of THC composition of BSV Emulsion or initiator solution Saline solution Temperature, ° С Time to reach
maximum temperature, min oil water initiator water thickener NaNO ₂ NH ₄ NO ₃ stabilizer initial maximum % % the least % % the least % % % name % 89 - UK eleven 47 - - 21 31 Koh one 22 one hundred 12,2 - - UK one hundred 69 - - fifteen fifteen Na ₂ CO ₃ one twenty 95 1,0 - 80 SAK twenty thirty PAA 0.15 28 40 Na ₂ CO ₃
pyridine 1,5
0.35 twenty one hundred 0.5 - 75 Hcl 25 thirty PAA 0.15 38.5 thirty NaOH
pyridine 1,0
0.35 21 99 0.5 - 65 HNO ₃ 35 36 PAA 0.25 25 37 K ₂ CO ₃
quinoline 1,2
0.55 eighteen 99.5 1,0 - 75 FeCl ₃ 25 47 - - 21 31 Na ₂ CO ₃ one twenty 97.5 2.0 - 75 CuCl 25 47 - - 21 31 Na ₂ CO ₃ one 21 87 5,0 95 - UK 5 40 - - thirty 29th Koh one twenty 94 14.0 99.5 - UK 0.5 40 - - thirty 29th Koh one twenty 72 21.0 81.0 6 UK 13 36 PAA 0.25 25,4 37 Na ₂ CO ₃
pyridine 1,2
0.15 19 102 37.0 80 10 UK 10 46 PAA 0.3 21 31 Na ₂ CO ₃
pyridine 1,5
0.2 24 97 53.0 60 32 UK 8 46 HS 0.2 21 31 Koh
pyridine 1,1
0.2 25 85 31,0 60 32 UK 8 46 HS 0.1 21 31 Koh
pyridine 1,2
0.2 23 97 40,0 88 - UK 12 45.6 PAA 0.5 21 31 Koh
pyridine 1,2
0.2 25 71.5 16,0 60 32 UK 8 45.5 PAA 0.6 21 31 Koh
quinoline 1,2
0.2 23 40 180.0 80 10 MK 10 36 PAA 0.25 25,4 37 Koh
pyridine 1,2
0.2 twenty one hundred 20,0 80 10 PC 10 36 PAA 0.25 25,4 37 Koh
pyridine 1,2
0.2 21 85 37.0 80 10 UK 10 36 PAA 0.25 25,4 37 Na ₂ CO ₃ pyridine 1,2
0.1 26 104 32,0

5 80 10 UK 10 36 - - 27 ¹ 37 - - 24 one hundred 24 Designations: UK - acetic acid;
MK - formic acid;
PC - propionic acid;
SAK - sulfamic acid.

For practical application, a method for treating the bottom-hole and remote zones of the productive formation in production wells with BSS and BSV thermogasochemical compositions, including injection of aqueous solutions of ammonium nitrate and sodium nitrite stabilized with additives (compositions of BSS and BSV), followed by injection of the initiating composition (solutions), is proposed acetic and hydrochloric acids).

The method for treating the bottom-hole and remote zone of the formation with the BSS thermogasochemical composition includes sequential injection of an inorganic salt in oil aqueous solution into a reverse emulsion well, a buffer liquid, which is used as oil or water, initiating the composition of an inorganic (hydrochloric) acid aqueous solution and subsequent injection of a selling liquid, fresh or saline water. As a result of mixing, a reaction is initiated, which proceeds with the release of a large amount of heat and gases. Gases formed during the reaction in natural fractures and pores create the pressure necessary to expand existing fractures and fracture, i.e. creating new cracks. An increase in temperature increases the pressure of the gases and creates a thermal effect, which also leads to the decomposition of ammonium nitrate with the release of additional heat.

Based on the obtained research results, the development of the technology for the preparation and injection of thermogasochemical composition of BSS in the well was carried out.

At the first stage of preparation of the thermogasochemical composition of BSS, an aqueous solution of inorganic salts was prepared in the following sequence. In a mobile storage tank with a volume of 10 m ³ previously pre-4800 l of water was pumped. After heating the water to a temperature of 45-50 ° C (using PUF), 190 kg of soda ash were dissolved. 3900 kg of ammonium nitrate were introduced into the prepared solution using a circulating system.

To the resulting solution of ammonium nitrate was added 2700 kg of sodium nitrite. The supply of sodium nitrite was carried out from a portable container into the solution stream. The density of the prepared solution was 1.32 g / cm ³ .

At the second stage, a reverse oil emulsion was prepared using 4 m ^{3 of} oil, an aqueous solution of inorganic salts in a volume of 9.4 m ³ and an SEM emulsifier. The total volume of the reverse emulsion is 13.5 m ³ .

At the third stage, 13.5 m ^{3 of} inverse oil emulsion was pumped into the well using the SIN-32 pumping unit. After injecting 1 m ^{3 of} separation oil buffer, a solution of hydrochloric acid of 12-14% concentration in a volume of 5.6 m ^{3 was} pumped into the well and 10 m ^{3 of} industrial water was injected.

The production rate of the well to stop the well "in idle" was 2 tons / day.

The well production rate after work, development and lowering of the downhole pumping equipment amounted to 7-9 tons / day.

The method for treating the bottom-hole and remote zone of the formation with the gas-chemical composition of BSV includes the sequential injection into the well of a high-viscosity aqueous solution of ammonium nitrate and sodium nitrite with stabilizers, a buffer liquid, which is used as oil or water, initiating the composition of an organic acid solution in a hydrocarbon medium and subsequent injection of a selling liquid (fresh or mineralized water). As a result of mixing, a reaction is initiated, which proceeds with the release of a large amount of heat and gases. Gases formed during the reaction in natural fractures and pores create the pressure necessary to expand existing cracks and fracture, i.e. creating new cracks. An increase in temperature increases the pressure of the gases and creates a thermal effect, which also leads to the decomposition of ammonium nitrate with the release of additional heat.

Based on the research results, industrial testing of the thermogasochemical composition of BSV in the well was carried out.

At the first stage of preparation of the thermogasochemical composition of BSV, an aqueous solution of inorganic salts was prepared in the following sequence. 5200 l of water was pre-pumped into a mobile storage tank with a volume of 10 m ³ . After heating the water to a temperature of 45-50 ° C (using PUF), 170 kg of soda ash were dissolved. 10 kg of polyacrylamide and 5100 kg of ammonium nitrate were introduced into the prepared solution using a circulation system.

3300 kg of sodium nitrite and 30 l of stabilizer were added to the resulting ammonium nitrate solution. Sodium nitrite was supplied to the solution stream. The density of the prepared solution was 1.38 g / cm ³ .

At the second stage, 4800 l of oil, 15 l of SEM emulsifier and 950 l of 70% acetic acid were used to prepare the initial composition of the emulsion of acetic acid in oil.

At the third stage, 10 m ^{3 of the} prepared aqueous salt solution was pumped into the well using the SIN-32 pumping unit. After injecting 1 m ³ of oil separation buffer into the well, 5.8 m ^{3 of} initiating composition, an emulsion of acetic acid in oil were injected, followed by 20 m ^{3 of} squeezing liquid as process water.

The production rate of the well to stop the well "in idle" was 2 tons / day.

The well production rate after work, development and lowering of the downhole pumping equipment amounted to 10-12 tons / day.

Claims (4)

1. Thermogasochemical composition for processing the bottom-hole and remote zones of the reservoir, obtained by sequential injection into the well of a fuel-oxidative composition of GOS and a reaction initiator, characterized in that GOS is used, containing, wt.%:
ammonium nitrate 15-50 sodium nitrite 15-40 stabilizer 0-2 emulsifier 0.1-2 oil 10-25 water rest
and a reaction initiator representing a 15-37% inorganic acid solution
or GOS, containing, wt.%:
ammonium nitrate 15-50 sodium nitrite 15-40 stabilizer 0-2 thickener 0.1-0.5 water rest
and a reaction initiator, which is a 15-100% solution or emulsion of an organic acid in a hydrocarbon medium. 2. The thermogasochemical composition for treating the bottom-hole and remote zones of the reservoir according to claim 1, characterized in that for the combustible-oxidizing binary composition of a stable BSS, an inverse emulsion of an aqueous solution of ammonium nitrate and sodium nitrite in oil with an emulsifier is prepared and pumped into the well, followed by injection of an inorganic acid solution in a ratio of 1: 1 to 3: 1. 3. The thermogasochemical composition for treating the bottom-hole and remote zones of the reservoir according to claim 1, characterized in that for the combustible-oxidative binary composition of the viscous BSW, a highly viscous aqueous solution of ammonium nitrate, sodium nitrite with the addition of a stabilizer and a thickener is prepared, followed by the introduction of a thermogas-forming the composition of the initiator of the chemical reaction in the form of a solution of an organic acid in a hydrocarbon medium. 4. A method for treating the bottom-hole and remote zones of a productive formation of production wells, which includes injecting GOS according to claim 1 into the reservoir, injecting buffer fluid into the reservoir, injecting the reaction initiator according to claim 1 corresponding to the injected GOS, injecting the squeezing fluid.

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